/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 26727
 * Date: 2024-11-16
 * Time: 15:08
 */
public class Demo5 {
    public static void main(String[] args) {
        StringBuffer s1 = new StringBuffer();
        s1.append("a");
        s1.append("b");
        s1.append("c");
        s1.append("d");

        System.out.println(s1.toString());
    }
}
